[R] RAM usage

[Thomas Lumley]

On Mon, 21 Oct 2002, Vaidotas Zemlys wrote:

> Hi,
>
>
>  >> I'm having problems while working with large data sets with R 1.5.1 in
>  >> windows 2000. Given a integer matrix size of 30 columns and  15000 rows
>  >> my function should return a boolean matrix size of about 5000 rows and
>  >> 15000 columns.
>
>  >That's  75million items of 4bytes each, hence almost 300Mb for that one
>  >object.
>
> Does that mean that R reserves 4 bytes for logical object with length 1? On
> the whole how much memory R allocates for different data types? I searched
> a bit, but I didn't find anything useful on this subject.

The information is implicitly in the help for .C/.Fortran.

R stores integer, factor and logical variables in vectors of C int,
numeric variables in vectors of C double. On most platforms these are 4
and 8 bytes respectively.  Lists are vectors of pointers, using 4 bytes
per element on 32 bit platforms, 8 bytes on 64bit platforms.

	-thomas


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